Electrical switching station



Dec. 24, 1935. A. M. ROSSMAN ELECTRICAL SWITCHING STP TION OriginalFiled Oct. 17, 1928 6 Sheets-Sheet 1 M11671 M Foss/ an B My A. M.ROSSMAN ELECTRICAL SWITCHING STATION 6 Sheets-Sheet 2 Original FiledOct. 17, 1928 n i u u 1 Qjlll Jfluerz (51 971/077 M fivssman Dec. 24,1935. A. M. ROSSMAN Re. 19,797

ELECTRICAL SWITCHING STATION Original Filed Oct. 17, 1928 6 Sheets-Sheet5 Q7770 an??? c/Wf'in ltd/701557726171 (lf tfflessi 6 Sheets-Sheet 4 A.M. ROSSMAN ELECTRICAL SWITCHING STATION Original Filed Oct. 17, 1928 HOPDec. 24, 1935.

um um w A. M. ROSSMAN ELECTRICAL SWITCHING STATION Original Filed Oct.17, 1928 6 Sheets-Sheet wiir z ssx 24,- 1935. A. M. ROSSMAN ELECTRICALSWITCHING STATION Original Filed Oct. 17. 1928 6 Sheets-Sheet 6 (Jr/vanZ297 M11677 M 170557776772 Wm -M f Realms Dec. 24, 1935 UNITED STATESPATENT OFFICE ELECTRICAL SWITCHING STATION Allen M. Bellman, Wilmette,11L, asalgnor by mes ts,

lessman, Sargent lb chieagmlllnaoor- Oi'lllnal N0). 1,830.4,datedNovember 3, 1931,

Serial No. 312,953, 0cm 11, 1928. Application for 691,856

October 3, 1933, Serial No.

32 Claims. ((1175-38) in detail, is adapted for 2300 volt service, butis' not to be limited to that potential. Stations of this class areoften termed distribution centers.

A bus for switch stations of this character has the duty'of subdividingthe electrical energy supplied thereto for distribution to users.

Switching equipment is required to connect and disconnect the incomingline and the outgoing feeders to protect them and their connectedapparatus from injury due to faulting and the like.

Voltage regulation is generally required to compensate for the load dropand for such .other causes as may tend to 'result in variation ofvoltage on the terminals of the consumers circuits. Preferably, eachfeeder has its own regulator.

The station may or may not include a transformer in the line. The bus ismerely a manifolding connection through which the feeders connect to thecommon incoming power line. The feeders and the line are provided withoil circuit breakers capable of breaking the circuits under load.

For the purpose of taking the oil circuit breakers out of service, atransfer bus is provided. This is a manifolding connection like the mainbus, constituting an alternative connection which may be employedtemporarily while the main bus and regulators and the main group of oilcircuit breakers are taken out of circuit. An oil circuit breaker ispreferably included in the connection of the line to the transfer bus sothat the line may be opened under load, if necessary.

Stations of this character, as heretofore constructed, have been undulycomplicated in construction and assembly and occupied excessive spaceand have been surprisingly unsightly in appearance.

According to the present invention, I provide a construction cheaper andbetter than heretofore known for this service, simpler in constructionand assembly, more compact and smaller in size, completely enclosed, andsightly in appearance.

The manner of accomplishing this will be more apparent from thefollowing specification and drawings, in which I have shown anembodiment of the invention which involves the use of sectionalenclosures for the feeders and their connections, complete housing ofall of the parts and insulation of the bus and connecting conductors inhigh grade self -healing insulation, such as insulating oil. The stationis made up of any desired number of standard units, these unitsincluding. in each case, parts which need only to be set up and boltedtogether with suitable ioining of the electrical parts as by splicing,with 10 consequently low cost of field work, which heretofore has beenunavoidably high.

Furthermore, in conjunction with my invention,

I have provided an improved form of transfer switch for switching thecircuit between the main ll and the transfer bus, which haspreviously'been accomplished by disconnect switches of the open airtype. According to the preferred form of my invention, I employ a formof selector switch embodying oil insulation making a compact unitsuitable for enclosure.

Preferably, the transfer switches with their connections are assembledin units corresponding to the main bus and switch units so that astation may be built up of units of substantially equal length, so thata balanced arrangement of partaprevails even in case it is necessary toincrease the station to accommodate a relatively large number of lines.

The-invention is applicable not only to three :hmase circuits, but tosingle phase circuits, as

Now, in order to acquaint those skilled in the art with the manner ofconstructing and operating my invention, I shall describe in connectionwith the accompanying drawings, a specific embodiment of my invention.

Figure l is a side elevational view, partly in section, of aninstallation embodying my invention; Figure 2 is a diagrammatic planview of the same; 7

Figure 3 is a diagram of connections;

Flgm-e 4 is a plan view, partly in section, showing the main bus andcircuit breaker connec: tions;

Figure 5 is a vertical sectional view of the same;

Figurefiisamodlfledformof unitcasingcom' struction, corresponding toFigure 4;

Figure 7 is a plan view, partly in section, of the transfer bus switch,shown at the right of Figure 1;

Flgure8isaplan view,partlyinsection. and

Figure 9 is a vertical section of a single phase switchingequipment;

Figure 10 is a plan view, partly in section, and

Figure 11 is a verticalsection of a modified form of a single phaseswitching equipment;

Figure 12 is a vertical section through the transfer switch and busstructure; and

Figure 13 is a plan view of a detail.

Referring now to Figure 1, in which I have shown in side elevation,partly in section, a

station embodying my invention, the incoming power line is indicated atI. This line may be connected to a transformer located at the stationherein shown, or it may be connected through suitable overhead orunderground conductors to a source of power which is to be subdivided inthe station. The conductor I, in the present case, enters as a threephase cable or as three single phase cables extending underground, asindicated in the dotted lines in Figure 1 and then up through a shortvertical run to the main bus and switching unit 2 where, as will beapparent by reference to Figure 3, it is adapted to make connection withthe main bus 3. In the diagram in Figure 3, the transformer 4 forsupplying power to the station is indicated. The incoming line isadapted to be connected to the main bus 3 through an oil circuit breaker5, such an oil circuit breaker being indicated at In in Figure 1. Bymeans of circuit breaker 6 and conductor II, the incoming power line Iis adapted to be connected to the transfer bus I in the transfer bus andswitch unit 8. The circuit breakers, such as 5 and 6, havedisconnectible contacts; that is, by lowering the circuit breakers, theymay be disconnected from the corresponding terminals, as is well-knownin the art. This is a feature which is well understood and I have notillustrated the same in detail, nor claimed the same as my invention. InFigure 1, one of the lines 9 is indicated as leaving the station byaerial conductors mounted upon the insulators I 2 on the poles such as13. The conductors of the line 9 enter cable l4 as through the pot headl5.

Obviously, the three phase line may be extended as three single phasecables l4. The cables l4 extend underground and then upwardly within thecasing l6 of the transfer bus and switch unit 6 through suitable potheads I! to terminals l3 (see Figure 7). From the terminals l3, withinthe bus housing l9, conductors 29 extend to the central terminal posts2| of the transfer switch mechanism 23. The contacts 2| are mounted uponsuitable insulator bushings 24. Conductors extend through these bushingsto the switch contacts 25 (see Fig. 12) mounted upon extensions of thebushings within the oil pot 26, which contains a bath of oil for theoperating parts of the transfer switch 23. The bottom wall 21 of thecasing l9 forms a suitable cover for the oil pot 26 and said oil pot 26is suitably suspended from the bottom wall 21. Adjacent the contactposts 2| and in line therewith. upon opposite sides, are contact posts29 and 23. These posts are likewise mounted upon suitable bushings 39and 3|. These bushings are mounted in the bottom wall 21 like bushing 24and extend downwardly into the oil pot 26 where they support the switchcontacts 34 and 35. Suitable switch contacts, such as 36 and 31, areprovided for making connection between the central contacts 25 andeither of the contacts 34 leading to the main bus, as will be explainedlater, or to the transfer bus I through contact 35. The posts 26 are, inturn, connected by conductors 38 to connecting posts 39 extending intobushings 49 and pot heads 4| into connection with the cables 42.

The contacts 36 and 31 are mounted upon 5 suitable operating rods 43,44, extending through tubular portions 45 mounted in the lower wall 21of the housing l9. Suitable operating mechanism for the rods 43 and 44is indicated at the levers 46 and 41 on Figure 7. The particularmechanism for raising and lowering the rods 43 and 44, and thereby thecontacts 36 and 31, is well known in the art and need not be disclosedherein in detail. Suflice it to say that by the handles 46 and 41,suitable rock shafts acting through arms and links, raise and lower theoperating rods and thereby the contacts. The contacts are operated ingroups of three for the three phase conductors, as will be apparent fromthe drawings, the installation shown in Figure l being a three phasesystem, although the diagram of Figure 3 is a single line diagram. 1

The individual housing l9, shown in plan in Figure '7 and in section inFigure 12 is duplicated for each line circuit. The housing I 9 has acover at 48 removably mounted thereupon for assembly and inspectionwhile in service. The casing l9 has an extension or neck 50 at each side(see Figure 7), provided with suitable coupling flanges 5| for boltingto the flanges of adjacent sections. In Figure 7, three units areindicated, namely, units 52, 53, and 54, all being alike andintercommunicating through the necks or tubular connections 59, joinedby the bolting flanges 5|.

The bus I is built up of sections of copper bar extending between theadjacent sections, such for example, as the bar 55 extending from theunit 54 to the unit 53. This bar 55 is connected to the unit 53 by astrap 56 mounted on the post 29 and likewise the unit 54 is connected toa strap 56 mounted on a corresponding post 29. In like manner, the otherconductors of the bus are formed of sections connected by straps onwhich they are supported from the corresponding posts 29. The straps,such as 56, are of graduated length, so as to space the bus conductors asuitable distance from each other and from the surrounding metal casing.The metal casing which is built up of the units 52, 53, 54, etc., ispreferably filled with insulating oil to a level well above the liveparts, as indicated by the dotted line shown in Figure 12. The bus isthereby completely submerged in oil. In installing a bus and switch unit9, the individual units with their corresponding individual basesections are set in place on a suitable foundation and are boltedtogether. The base for the units of the transfer bus and switchstructure are made of suitable steel sections and may be covered withsheet metal removable sides if desired. The same form 60 of structuremay be employed in making up the bases for the main bus and switchstructure. The covers, such as 48. are removed and the bus I is built upby inserting the bus sections, such as 55, through the bolted necks ortubular exten- 55 sions 50 and then clamped in place tothe supportingstraps, such as 56, and to the ends of adjacent sections. The sections55 are all of the same length and, hence, are interchangeable inassembly.

All that is required in installing the units, therefore, is to bolt themtogether at the flanges 5|, insert the bus conductor sections throughthe open tops, and extend them through the necks 59 and bolt them inplace through the straps 56 conductorl6,leadingtothebus'lortothecable62, which extends to the induction regulator ll, whichissetonafoundationbetweenthe transfer bus andswitchunitsl and themainbus and switch units2. The cable 62 extendsdowninside thesupportingbasellandundergroundthrough a suitable conduit upward along the side of theinduction regulator 66 toapot head, asindicated atll.homasimilarpotheadltacableflextends to pot head 6|, extending intocasing 62. Thecasingllismoimiedontheupperendofthe supportingbasefl.compartments 6! and 66, in the former of which are mounted the currenttransformers 66 and suitableterminalpostsflleadingtotheoilcircuitbreakerssuchas |l,showninFigure1. In the compartment 66 ismounted the main bus! andaconnectlngpost6lleadingtotheopposite.

terminal of the ofl circuit breakers ll. Preferably, but notnecessarily, both compartments 63 and 66 are fllledwithinsulatingoiltoalevelas indicated in dotted lines in Figure 5. The pot head 6i, in thepresent instance, is a single conductor cable pot head extendingupwardly in the form of a bushing 66 and the conductor therefrom beingjoined to the terminal of the current transformer 66. The oppositeterminal of the current transformer 66 is connected by a strap to thepost 66.

As an alternative arrangement, a three phase cable, as indicated at illin Figure 5, may be employed and the conductors from this cable fannedout, as indicated at II, to the terminals I2 of the current transformers65, the opposite ends of which are connected to corresponding terminal66 mounted on and in suitable bushings i3, supported on the lower wall14 of the casing 62. In this case, that is, where a three conductorcable is employed, a suitable common pot head I! is provided and thismay be fllled with compound, oil, or may be otherwise treated to fan outthe conductors and hold them in a permanently insulated relation and, atthe same time, to close oil? the opening in the lower wall ll of thecasing 62 where the conductors ii enter the same.

Obviously, as indicated in dotted lines in Figures 1 and 5, the incomingcable connection may be made above instead of below the casing 62.Referring to Figure 6, the construction of the individual casingsections will be understood. In Figure 6, there are shown three unitsl1, l6 and 19. They are all alike, unit It being shown in detail. Thecasings 62 are built up of sheet metal with removable covers, adapted tobe bolted down and having connecting openings as indicated at 8li86,between the individual casings of the units l1, l6 and i8, suitablegaskets and plates 6i, as shown in Figure 13, being interposed and thecasings of the units being bolted together by bolts, such as BI, fromthe inside. The cover is preferably made in sections and the casing,such as 62, has a peripheral inturned flange 86 extending around themargin with suitable bridging pieces, such as 86 and 86, extendingcrosswise of 'the top of the casing to permit the sections of the coverto be separately attached.

The construction of the casings containing the live parts such as busconductors, current transformers and the like of fabricated sheet metalas above stated has been found to have a peculiar advantage notheretofore attained.

Metal enclosed busses are old, but as far as I Thecasingflcomprlsestwoamawarecastmetalhasalwaysbeenemployed.'Ihereareanumberofreasonsforthis,chiefof which are the simplicity ofmaking relatively complex forms and the abilltyto cast theenclosureinsectionswhichcanbemachinedand g clamped together to make arelatively tight enclosure. The cast metal enclosure has heretoforealsoservedastheframeforsupporflngflie circuit breakers or theirterminals. Also such prior cast bus enclosures have heretofore gen- 10erally been filled. with a compound and not a fluid insulation. 7

Such cast enclosures have the undesirablequalityofcrackingandshatteringincaseofa fault within the same, whichresults in an ex- 15 plosion. To use them with insulating oil which isinflammable and which flaming oil would, if the enclosure wereshattered, be splashed over everything nearby is particularlyundesirable as is known to those skilled in the art.

My enclosures being built up of sheet metal will not shatter ifsubjected to an explosion. For equal strength my enclosures arerelatively much lighter and even if they should be ruptured, they willnot produce the bomb effect with the consequent spraying of burning oilover the adjacent apparatus or attendants.

I believe that this combination is broadly new in installations of theclass to which my invention relates.

The bus enclosure is supported on a frame built up of structural steelparts.

By the above type of construction further advantages are secured. Withthis type of construction the construction and storage of patterns formaking large and numerous castings is not required. The fabrication ofsheet metal units requires no heavy manufacturing or handling machineryas is required for large castings. The fleld labor of assembling is muchless.

A further advantage resides in the compactness which may be secured. Thewalls of the compartments may be made much thinner and hence occupy lessspace. Also less metal is subjected to magnetic losses. 5

Also in shipment the units are easier to handle, are lighter, and lesssubject to breakage.

This construction is shown more in detail in Figure 5. The compartments63 and 64 are separated by a wall 81, which bears at its upper edge thecross strip 85. The main bus 3 is built up of bus section such, forexample, as the section 88 (see Fig. 6) and strapv members 89 boltedtogether and the strap members 89 being supported from the inside ofposts 61. The straps 89 are graduated in length, so as to space the busconductors properly with respect to each other. Preferably, bothcompartments of the casing 62, in each case, are filled with insulatingoil or other suitable insulating liquid. The posts 61 are mounted uponsuitable insulating bushings 90 and these, in turn, are mounted upon thebottom wall 16 of the casing 62. Conductors extend through the bushings90 and II, as will be apparent from Figure 5, into the depending tubesBI and 92, which are open at their lower ends and provided with suitabledisconnectable contacts, so that the circuit breakers, such as ll, maybe disconnected by dropping the same downwardly in the supporting casing63. These tubes 9| and 92 are preferably formed of metal, with suitableinsulation disposed therein and the sockets for the disconnectablecontacts being mounted within the tubes, so that the bushings 92 and 96of the oil circuit breaker II which carry suitable contacts at theirupper ends may close the circuit at the sockets and 36 indicated indotted lines in Figure 5. As an alternative method of Joining the units11, 18 and 19, suitable necks, such as 01, having bolting flanges 98,may be provided on each side of the casing section, as indicated inFigure 4.

The casing sections are slightly narrower in Figure 4 or the spacing ofthe casing sections may be increased if desired. It is preferable, asindicated in the diagram of Figure '2, which shows the general layout,to have the units, such as 11, 10 and 19 of the main bus and switchstructure 2, of

substantially the same width as the corresponding sections 52, 53 and 54,of the transfer bus and switch unit 0. Induction regulators, such as53, occupy considerably more space in width than do the individual unitsof either the main bus and switching structure or the transfer bus andswitching structure. However, by arranging two rows of inductionregulators, as shown in the diagram of Figure 2, I am able to provide arelatively compact structure. In case of a larger number of lines, theinduction regulators may be arranged edgewise instead of transversely orarranged in more than two rows.

The resultant structure is compact and sightly, and requires no housing,everything being enclosed and all of the live parts may be completely'insulated either by a bath of oil or by suitable cable insulation.

while the above embodiment has been described specifically with respectto three phase distribution, it is to be understood that the inventionis applicable equally to single phase distribution. For example, inFigures 8 and 9, I have illustrated a single phase bus and switchconstruction which shows the manner in which the invention may beembodied in a single phase installation.

In this case, a single bus 39 is employed for the transfer bus, theconductor thereof is made up of sections, such as I02, extending intothe flanged necks IOI where short joining bars, such as I03, may bebolted to the ends of the section I02 for joining one unit to theadjacent units. The bus section I02 is connected by a suitable strap I04to the post I05 mounted on bushing I03 carrying at its lower end theswitch contact I01.

The incoming line enters through cable I08, pot head I09, into the lowerwall of the section of the casing I00, through the bushing H0 and isconnected to post III, this post, in turn, being connected by a shortsection of bus bar II2 to the post H3, which is mounted upon a suitablebushing extending through the lower wall of the casing and providingconnection with the central switch contact Ill. A switch contact II5mounted on a suitable bushing, extending through the bottom wall of thecasing, is connected to the post H6 and it, in turn, is connected topost II1, leading through a cable connection to the main bus unit, whichwill be constructed in substantially the same manner as described inconnection with the foregoing modification, except that a single phasebus and single circuit breaker are employed. The transfer switch IIOcomprises the movable contact members H3 and I20, adapted to be operatedfor closing the circuit either to the transfer bus 03 through thecontacts Ill and I01 or to the main bus through contacts Ill and H5.Suitable operating mechanism is provided for raising and lowering thecontacts H3 and I20, as will be well understood by those skilled in theart.

In Figures 10 and 11, I have shown a modified form of the single phasearrangement in which the transfer bus 90 is built up of sections, suchas I2I, extending from one section to the adJacent section, as disclosedin connection with the pre- 5 ferred form in Figure l, a strip orsection of bus bar I22 connecting the bus sections to a post I23 mountedon a suitable bushing carrying at its lower end within the oil pot ofthe transfer switch, a switch contact I24. The incoming line enters inthrough cable I00, pot head I09, bushing IIO, to post III. This post isconnected by a conductor I25 to the post I26, which extends through asuitable bushing down through the bottom wall of the casing to a switchcontact I21. The post I26 vis connected to another post I23 by aconductor I30. The post I23 extends down through a suitable bushing andcarries a switch contact directly back of the switch contact I24, shownin Figure 11. Similarly, a post I3I, lying in line with the post I29,bears a switch contact which is directly back of the contact I21 shownin Figure 11. It is, in turn, adapted to be connected to the contact ofthe post I29 by a switch member I32, shown in Figure 11, the contactsI21 and I2! being adapted to be connected by the switch member I 33. Thepost I3I is, in turn, connected to post I34, leading to the main bus andswitch structure.

The transfer switch I30, having the movable 30 contact members I32 andI33, is adapted to bring them alternatively into engagement with theircontacts so that posts I26 and I23 are connected in one position of theswitch mechanism I35 and the posts I3I and I23 are, at that time,discon- 35 nected.

In another position of the switch I35, the posts I3I and I 23 areconnected and the posts I23 and I26 disconnected. The two schemes shownin Figures 8, 9, and 10, 11, while comprising differcut embodiments, arecapable of securing the same general functions and results.

By the above described scheme of construction, the units are allinterchangeable, regardless of the number of lines that are to be servedand the design and construction of any size station, within limits, isrendered exceedingly simple. If the station is to be extended to includeanother line, another unit is added to the main bus and switch structure2, likewise another unit is added to the transfer bus and switchstructure 8 and an additional induction regulator mounted between themor at any suitab'e point. While I have shown the induction regulators asmounted between the main and transfer units, it is to be understood thatthis may be varied without in any wise departing from the invention,since the advantage of unitary construction, complete-enclosure, oilinsulation of the buses, and sightliness may all be secured, even thoughthe parts are differently arranged from what I have shown as thepreferred mode of arrangement. The base of the main structure 2 permitsthe oil switches, such as I0, to be dropped for disconnecting them andthe bases I0 for the transfer units 0 permit the oil pots of thetransfer switch to be lowered, so as to disclose the transfer switchcontacts, if desired. The transfer switch, while it is made in the formof an oil switch, is not intended to be employed for breaking thecircuit under load.

It is merely an oil enclosed disconnecting switch conveniently operableand insulated in oil, so as to be a compact and eflicient construction.

It is to be understood that, if desired, another form of transfer switchmechanism may be emram Y I ployed withoutdeparting from the broad scopeof myinvention. The entire system is weatherproof. Optionally, on indoorservice, the oil bath for the busesmay be omitted, although I considerit a highly desirable feature.

Auxiliary apparatus may be installed in suitable housings as adjuncts tothe station. and a section of the transfer structure which correspondsto the arrangement of the circuit breakers I and 6 (see Figure 3) may bedevoted to an:- iliary apparatus such as meters and the like, althoughthis is optional. I do not intend to be limited to the details shown anddescribed, except as they are recited as essential in the ap pendedclaims. 1

I claim:

1. In a station of the class described, a plurality of main bus andswitching units, a plurality of transfer bus and switching units, saidunits being structurally separate, each main bus unit comprising acasing section, a load circuit breaker and bus conductor sections, thetransfer units each comprising enclosed oil insulator transfer switchesnot suited for load interruption, and metal sheathed cables extendingbetween the main units and the transfer units and in series with thecircuit breakers and the transfer switches.

2. In a station of the class described, a main bus and switchingstructure, comprising an enclosed bus and a plurality of circuitbreakers connected thereto, a transfer bus and switch structurecomprising an enclosed bus and a plurality of liquid insulated two waytransfer switches connected thereto, said structures being structurallyindependent and extending parallel to each other, and outgoing feedersconnected to the two way transfer switches, said two way transferswitches having seective connection to the transfer bus directly and tothe main bus through the oil circuit breakers and metal clad cablesforming the electrical connections between said structures.

3. In a station of the class described, a pinrality of main bus andswitching units, each unit comprising a casing section containing asection of the main bus and having an enclosed oil circuit breaker oftheload interrupting type, the casing sections being connected togetherand the bus sections being connected together to form a main bus, aplurality of transfer bus and switching units, each unit comprising acasing section containing a section of the transfer bus and having anenclosed oil filled two way transfer switch of an interrupting capacitynot suitable for breaking the circuit under load, the latter casingsections being connected together and the latter bus sections beingconnected together to form a transfer bus, a power supply line, enclosedoil circuit breakers ofload interrupting type for connecting said supplyline to the main bus and to the transfer bus, feeders connected to thetransfer switches and connectible by the transfer switches directly tothe bus and through the oil circuit breakers to the main bus andsheathed cables forming the electrical connections between said circuitbreakers and said transfer switches.

4. In a system of the class described, a main bus, a transfer bus,individual casings for the buses, a power supply conductor, oil circuitbreakers, of load interrupting type for connecting said power supplyconductor ,to said main bus and to said transfer bus. said oil circuitbreakers beirg mounted below the main bus casing and having socket typeconnections for disconnection of the oil circuit breakers from the mainbus feeders, enclosed liquid insulated two wayswitches for connectingthe feeders to either the main bus or to the transfer bus, said two-wayswitches being mounted below the transfer bus casing and oil circuitbreakers of the load inter- 5 rupting type in the connections betweenthe two wayswitchesandthemainbus andlikewisebeingmountedbelowthemainbuscasinmlmd metal sheathed casingsforming the connection between said oil circuit breakers and said two-10 way switches.

5. In a system of the class described, a main bus and switch structurecomprising anenclosed main bus and enclosed oil circuit breakersconnected thereto, a transfer bus and switch structure. comprising anenclosed transfer bus and enclosed liquid insulated two way transferswitches, said structures being spaced apart and having individualsupporting bases, said latter structiu'e comprising connected casingsections each enclosing bus sections and a plurality of of liquidinsulated terminals comprising one terminal connected to thecorresponding bus section, another terminal connected in the main busthrough one of said oil circuit breakers, and an intermediate terminal,movable switch means for switching said terminals and a feeder conductorconnected'to said intermediate terminal and sheathed cables forming theconnections between said oil circuit breakers and said transferswitches.

6. In combination, a plurality of outgoingfeederlines,amainbusandswitchstructurecomprising a pluralityof bus andswitch units corresponding to the lines, each unit comprising a closedhousing, adjacent housings being in communication, main bus sections foreach unit disposed in said communicating housings and circuit breakersconnected on one side to the corresponding main bus sections, acorresponding plurality of transfer bus and switch units each comprisinga closed housing having therein a corresponding bus section and having acom- -municating two way liquid insulated selector switch comprisingthree terminals, one terminal 4 being connected to the correspondingtransfer bus section, another being connected to the cor responding mainbus section through its associated circuit breaker, the third connectedto the corresponding line conductor, and means for connecting the thirdterminal to either of the other two, the main bus and switch structurescomprising one structural unit and the transfer bus and switch structurecomprising a separate structural unit, said units being spaced apart andmetal clad cables connecting them.

'1. A transfer bus and switch structure, comprising a bus housing formedof a plurality of housing units connected together side by side andhaving a continuous e, two insulated switch posts supported in eachhousing section and having conductors extending through the easing intoconnection with said posts, bus conductors comprising sectionscorresponding to the housing units Joined together and extending lon- 6gitudinally of said passageway, a switch post in each housing sectionconnected to the corresponding bus section, and selector means forselectively connecting said posts in each housing section and pairs ofunderground cables termi- 'll) nating in posts in each of said housingunits.

8. A bus and switch structure, comprising a bus housing formed of aplurality of housing units having registering openings, said units beingconnected together side by side, so that the open- (I ings form acontinuous passage, a bus comprising sectional bus conductorscorresponding to the housing units, insulated posts on the housing unitshaving transverse conductors extending into contact with the busconductors and supporting the same, liquid insulated switching meansindividual to the housing units disposed below the housing units andcomprising extensions of said posts, said switching means eachconstituting a two way selector switch.

9. In a section of the character described, a

transfer bus having associated transfer switches,

a housing enclosing said transfer bus, a bath of oil in the housing forinsulating the transfer bus and its associated conductors, groups ofinsulated terminal posts mounted in and extending through the bottomwall of the housing and having switching contacts at their lower ends,oil pots for said groups of switching contacts, and movable selectorswitch means disposed in said oil pots for selectively connecting saidswitching contacts.

10. In a station of the class described, a transfer bus and switchstructure comprising a transfer bus, a plurality of housing sectionseach section having a bus enclosing portion, said sections beingconnected together to form an enclosure for the bus, insulated postsmounted in the bottom wall of each housing section, having their upperends forming terminals within the housing section and the lower endsbearing switch contacts outside the housing section, a pair of insulatedconductors entering each housing section and connected to correspondingterminals, a conductor within the housing section joining anotherterminal to the bus, an oil pot for said switch contacts of each housingsection, and selectively operable switch means within the oil pot forconnecting said switch contacts.

11. In a station of the class described, a traw fer bus and switchstructure comprising a transfer bus, a plurality of connected housingsections, each section comprising a longitudinally extending portion forhousing a section of the transfer bus and a laterally extending portion,a main bus connection and a feeder line connection, extending into eachlaterally extending at their lower ends, means for maintaining a bath ofoil'about said switch contacts, and movable selector switch meanscooperating with said contacts for selectively connecting the feederline to the main bus or to the auxiliary bus.

12. In a bus and switch structure, a plurality of similar housing unitshaving registering openings, said units being connected together toprovide a continuous passageway through said openings, sectional busconductors extending through said passageway, switch posts havingtransverse connectors extending into contact with the bus conductors,switch posts adjacent the first-named switch posts, lines connected tosaid second named switch posts, a third group of switch posts mountedadjacent the second group of switch posts, end conductors connected tosaid third group of switch posts, all of said switch posts being mountedon the bottom wall of the casing sections and having switch contactsdisposed below the bottom wall thereof, oil pots enclosing the switchcontac s of each housing unit and movable switching members disposed insaid oil pots for connecting the contacts of the second group of postswith the contacts of the other groups of posts selectively to put theline conductors selectively in circuit 5 with the transfer bus or withthe last named conductors.

13. In a station of the distribution center type, the combination of anincoming power supply line and one or more outgoing power distributionlines, a main bus and circuit breaker device comprising a main bus andoil circuit breakers structurally joined into a common unit, a transferbus and selector switch device comprising a transfer bus and an oilinsulated transfer switch, structurally joined into a separate commonunit, said main bus and circuit breaker device comprising a power supplyline load circuit breaker connected between the incoming power supplyline and the main bus, and comprising also a power supply line loadcircuit breaker between the incoming power supply line and the transferbus, and comprising also an outgoing line load circuit breaker for eachline circuit, connected between the main bus and the correspondingselector switch in the second device, said selector switches havingmovable members for connecting the outgoing power distribution lines toeither the transfer bus or to the main bus, the latter connection beingmade through the outgoing line load circuit breakers aforesaid.

14. In a station of the class described, the combination of an incomingpower supply line, one or more outgoing power distribution lines, a mainbus and circuit breaker device comprising a main bus and oil circuitbreakers strudturally joined into a common unit, a transfer bus andselector switch device comprising a transfer bus and one or more oilinsulated selector type transfer switches, all structurally joined intoa separate common unit, said selector switches having selectablecontacts and movable selecting contacts, said main bus and circuitbreaker device comprising a power supply line load circuit breakerconnected between the incoming power supply line and the main bus, andcomprising also a power supply line load circuit breaker between thepower supply line and the transfer bus, and comprising also an outgoingline load circuit breaker for each outgoing line connected on one sideto the main bus, a connection for each line extending from the otherside of said last named circuit breakers to the selectable contact ofthe corresponding selector switches, regulators included serially insaid last named connections, the outgoing lines being connected to theselecting contacts, of the said selector switches, to permit feeding ofsaid lines from either the main bus or from the transfer bus.

15. In a station of the class described, the combination of an incomingpower supply line, one or more outgoing power distribution lines, a mainbus and circuit breaker device comprising a main bus and oil circuitbreakers structurally joined into a common, enclosed and metal-cladunit, said oil circuit breakers being provided with slip terminals fordisconnection by removal of the same, a transfer bus and selector switchdevice comprising a transfer bus and one or more oil insulated selectortype transfer switches, all structuraly joined into a common,metal-sheathed and enclosed unit, said selector switches havingselectable contacts and movable selecting contacts,

said selecting contacts comprising pairs of movable members adapted toclose the connection to 15 bothbusesbeforedisconnectingeitherbuasothattheloadmaybeshiftedfromonebustothe other without interruption, saidmain bus and circuit breaker devices comprising a power supply line loadcircuit breaker connected between the incoming power supply line and themain bus, and comprising, also, a power supply line load circuit breakerbetween the power supply line and the transfer bus, and comprising alsoan outgoing line load circuit breaker for each outgoing line, connectedon one side to the mainbus, a connection for each line extending fromthe other side of said last named circuit breakers to the selectablecontacts of the co selector switches, regulators included serially insaid last named connection, the outgoing lines being connect-ed to theselecting contacts of the said selector switches to permit feeding ofsaid lines from either the main bus or from the transfer bus, either busbeing capable of complete disconnection from the power line when theload is carried by the other bus. the connections between said devicesand said re lators comprising lead sheathed cables terminating in potheads-at each end thereof.

16. A bus and switch structure for a station of the class described,comprising a plurality of sections joined together to provide acontinuous passageway through the sections, said sections having lateralextensions divided oil from the continuous passageway by barrier wallsto provide chambers, a sectional bus extending through said continuouspassageway, circuit breaker terminal posts mounted in the sectionsadJacent the bus and corresponding circuit breaker terminal postsmounted in the associated chambers, circuit breakers connected to saidterminal posts and disposed below the sections and means for bringingpower conductors into the said chambers for connection to the associatedcircuit breaker terminal posts in said chambers.

17. A bus and switch structure for a station of the class described,comprising a plurality of sections joined together to provide acontinuous passageway through the sections, said sections having lateralextensions divided off from the continuous passageway by barrier wallsto provide chambers, a sectional bus extending through said continuouspassageway, circuit breaker terminal posts mounted in the sectionsadjacent the bus and corresponding circuit breaker terminal postsmounted in the associated chambers, circuit breakers connected to saidterminal posts and means for bringing power conductors into saidchambers for connection to the associated circuit breaker terminal postsin said chambers, and current transformers for said conductors disposedin said chambers, said continuous passageway and said chambers being oilfilled to insulate the electrical parts disposed therein.

18. A bus and switch structure comprising a plurality of longitudinallyextending casing sections joined together endwise to provide apassage'way through the sections, said sections having lateralextensions divided off from the continuous passageway by barrier wallsto provide associated chambers, a sectional bus extending through saidcontinuous passageway, the sections of the bus being joined together toform electrically continuous conductors, circuit breaker terminal postsmounted in the casing sections adjacent the bus and connected to the busconductors; corresponding circuit breaker terminal posts mounted in theassociated chambers, circuit breakers having terminals for connectionwith said terminal posts and disposed below the sections, disconnectingcouplings between the said terminal posts and the circuit breakerterminals, current transformers disposed in the associated chambers andconnected to the said terminal posts in said chambers, and means forbringing power conductors into the said chambers .for connection to saidcurrent transformers, said casing sections and associated chambers beingfabricated of wrought metal. 10 19. In combination a hollow fabricatedframe, a fabricated wrought metal casing section disposed upon the frameand having a eway extending longitudinally therethrough, sections of busconductors disposed longitudinally within the casing section, conductingstuds extending from within the casing section to a point within thehollow frame and being connected to the bus conductor sections, afabricated wrought metal chamber mounted on the frame adjacent thecasing section, conducting studs extending from within the chamber to apoint within the hollow frame, a circuit breaker mounted within andsupported by the hollow frame and having terminals registering with thedownwardly extending studs, andmeans for bringing power conductors intosaid chamber for connection to the corresponding conducting studstherein.

20. In combination a hollow fabricated frame, a fabricated wrought metalcasing section disposed upon the frame and having a passageway extendinglongitudinally therethrough, sections of bus conductors disposedlongitudinally within the casing section, conducting studs extendingfrom within the casing section to a point within the 85 hollow frame andbeing connected to the bus conductor sections, a fabricated wroughtmetal chamber mounted on the frame adjacent the casing section,conducting studs extending from within the chamber to a point within thehollow frame, a circuit breaker mounted within and supported by thehollow frame and having terminals registering with the downwardlyextending studs, current transformers disposed in the chambers andconnected to the corresponding conducting studs, and means for bringingpower conductors into the chamber for connection to the currenttransformers. a

21. In metal clad switchgear including a supporting frame and a; switchunit having disconnecting contacts vertically movable therein toconnected and disconnected positions, asuperstructure mounted on saidframe comprising a unitary sheet metal housing having a metallicisolating partition for dividing the same into compartments including abus bar compartment, said compartments having apertures in the bottomwall thereof on opposite sides of said partition and said bus barcompartment provided with removable cover structure at opposite endsthereof, and insulating shields supporting fixed disconnecting contactsmounted in and extending through said apertures, said fixeddisconnecting contacts being connected to busbars in said bus barcompartment and to electrical conductors in another of saidcompartments.

22. In metal clad switchgear including a supporting frame and a switchunit having disconnecting contacts vertically movable therein toconnected and disconnected positions, a superstructure mounted on saidframe comprising a unitary sheet metal housing having a metallicisolating partition for dividing the same into compartments including abus bar compartment, said compartments having apertures in the bottom 15wall thereof on opposite sides of said partition and said bus barcompartment provided with removable cover structure, and insulatingshields supporting fixed disconnecting contacts, said insulating shieldsbeing mounted in and extending through said apertures and including aninsulating bushing within the superstructure, said fixed disconnectingcontacts being connected to busbars in said bus bar compartment and toelectrical conductors in another of said compartments.

23. In metal clad switchgear including a supporting frame and a switchunit having disconnecting contacts vertically movable therein toconnected and disconnected positions, a superstructure mounted on saidframe comprising a shatterproof housing having an isolating partitionfor dividing the same into compartments including a bus bar compartment,said compartments having apermres in the bottom wall thereof on oppositesides of said partition, fixed disconnect contacts carried by thesuperstructure and cooperating with the movable contacts, and insulatingshields surrounding the fixed disconnecting contacts, said fixeddisconnecting contacts being connected to busbars in said bus barcompartment and to electrical conductors in another of said compartmentsand extending the circuit through the apertures.

24. In metal clad switchgear including a supporting frame and a switchunit having disconnecting contacts vertically movable therein toconnected and disconnected positions, a superstructure mounted on saidframe comprising a shatterproof housing having an isolating partitionfor dividing the same into compartments including a bus bar compartment,said compartments having apertures in the bottom wall thereof onopposite sides of said partition, and insulating shields supportingfixed disconnecting contacts,-

conductors mounted in the shields and extending from the fixeddisconnecting contacts through said apertures and connected to busbarsin said bus bar compartment and to electrical conductors in another ofsaid compartments.

25. In an electric system, a plurality of metal clad switchgear eachincluding a supporting frame and a switch unit having disconnectingcontacts vertically movable therein to connected and disconnectedpositions and a superstructure mounted on said frame, comprising aunitary sheet metal housing having an isolating partition for dividingthe same into compartments including a bus bar compartment, saidcompartments having apertures in the bottom wall thereof on oppositesides of said partition and said bus bar compartment provided withopenings at opposite ends thereof, and insulating shields supportingfixed disconnecting contacts, said shields being mounted in andextending through said apertures, said fixed disconnecting contactsbeing connected to busbars in said bus bar compartment and to electricalconductors in another of said compartments, the respective switchgearbeing in alignment, the openings in the bus compartments of the adjacentswitchgear being in communication, and the bus bars extending throughthe openin s.

the same into compartments, one of said compartments housing busbars andthe other of said compartments housing current transformers and feedercable connections, disconnecting contacts disposed on opposite sides ofsaid partition for 5 coacting with said movable disconnecting contacts,and supporting means for said feeder cable connections mounted in theover a g ng bottom wall structure of said housing.

27. In metal clad switchgear including a supo porting frame and a switchunit having disconnecting contacts vertically movable therein toconnected and disconnected positions, a superstructure mounted on saidframe comprising a shatterproof housing having an isolating partitionfor dividing the same into compartments, one of said compartmentshousing busbars and the other of said compartments housing currenttransformers and feeder cable connections, disconnecting contactsdisposed on opposite sides of said partition for coacting with saidmovable disconnecting contacts, and feeder cables extending into thehousing and terminating at said feeder cable connections.

28. In metal clad switchgear including a supporting frame and a switchunit having disconnecting contacts vertically movable therein toconnected and disconnected positions, a superstructure mounted on saidframe comprising a shatterproof housing having an isolating partitionfor dividing the same into compartments, one of said compartmentshousing busbars and the other of said compartments housing currenttransformers and feeder cable connections, and disconnecting contactsdisposed on opposite sides of said partition for coacting with saidmovable disconnecting contacts.

29. In metal clad switchgear including a supporting frame and a switchunit having disconnecting contacts vertically movable therein toconnected and disconnected positions, a superstructure mounted on saidframe comprising a unitary sheet metal housing having an isolatingpartition for dividing the same into compartments, one of saidcompartments housing busbars and the other of said compartments how ingcurrent transformers and feeder cable connections, disconnectingcontacts disposed on opposite sides of said partition and located belowthe bottom wall of said structure for coacting with said movabledisconnecting contacts and establishing circuit connections between saidmovable disconnecting contacts and the bus in said bus bar compartmentand electrical conductors in another of said compartments, andsupporting means for said feeder cable connections mounted in the wallstructure of said housi 30. In an electric system, a plurality of metalclad switchgear each including a supporting frame and a switch unithaving disconnecting contacts vertically movable therein to connectedand disconnected positions and a superstructure mounted on said framecomprising a unitary sheet metal housing having an isolating partitionfor dividing the same into compartments, one of said compartmentshousing busbars and the other of said compartments housing currenttransformers and feeder cable connections, disconnecting contactsdisposed on opposite sides of said partition for coacting with saidmovable disconnecting contacts, and supporting means for said feedercable connections mounted in the wall structure of said housing, theswitchgear being adjacent one another and the bus bar comoartments ofthe respective switchgears being in alignment and connected together toform a continuous chamber, the bus bars extending longitu- 31.superstructure for -metal clad switchgear of the drop-down typeincluding a supporting frame and a switch unit having disconnectingcontacts vertically movable therein to connected and disconnectedpositions, comprising a unitary 1o sheet metal housing having a metallicisolating partition for dividing the same into a busbar compartment anda current transformer compartment, fixed conducting means disposed ineach of said compartments and establishing cirll cuit connectionsthrough apertures in the bottom walls of said compartments with saidmovable disconnecting contacts, said busbar compartment having aperturesin the side walls thereof for permitting inspection and extension 80 ofthe busbars therein, removable cover members for said apertures,removable cover structure forming part of the top of said housing forper:

cluding the connections to the fixed conducting 25 means and forpermitting access to the current transformers and connections thereto insaid transformer compartment.

Reissue No. 19,797

(Seal) dinally through the connected bus compartments.

mitting access to both of said compartments in- 32. superstructureformetal clad switchgear of the drop-down type including a supportingframe and a switch unit having disconnecting contacts vertically movabletherein to connected and disconnected positions. comprising a unitary 5sheet metal housing having a metallic isolating partition for dividingthe same into a busbar compartment and a current transformercompartment. fixed conducting means disposed in each of saidcompartments and establishing cirl0 cuit connections through aperturesin the bottom walls of said compartments with said movable disconnectingcontacts, said conducting means including fixed disconnecting contactsengageable by the movable disconnecting contacts, said 15 bus barcompartment having apertures in the side walls thereof for permittinginspection and extension of the busbars therein, closures for saidapertures, removable cover structure forming part of the top of saidhousing for permitting acso cess to both of said compartments, includingthe connections to the fixed conducting means and for permitting accessto the currenttransiormers and connections thereto in said transformercom- 25 partment.

ALLEN M. ROSSMAN.

CERTIFICATE OF CORRECTION.

December 24, 1935.

. ALLEN m. ROSSMAN.

It is hereby certified that the name of the assignee in the abovenumbered patent was erroneously described and specified as"RossmamSargent & Lundy Patents Corporation, of Chicago, Illinois"whereas said name should have been described and specified as Ros'smanEngineering Company, a Corporation of Illinois, as shown by the recordsof assignments in this office; and that the said Letters Patent shouldbe read with this correction therein that the same may conform to therecord of the case in the Patent Office.

Signed and sealed this 18th day of February, A. D. 1936.

Leslie Frazer Acting Commissioner of Patents.

ments of the respective switchgears being in alignment and connectedtogether to form a continuous chamber, the bus bars extending longitu-31. superstructure for -metal clad switchgear of the drop-down typeincluding a supporting frame and a switch unit having disconnectingcontacts vertically movable therein to connected and disconnectedpositions, comprising a unitary 1o sheet metal housing having a metallicisolating partition for dividing the same into a busbar compartment anda current transformer compartment, fixed conducting means disposed ineach of said compartments and establishing cirll cuit connectionsthrough apertures in the bottom walls of said compartments with saidmovable disconnecting contacts, said busbar compartment having aperturesin the side walls thereof for permitting inspection and extension 80 ofthe busbars therein, removable cover members for said apertures,removable cover structure forming part of the top of said housing forper:

cluding the connections to the fixed conducting 25 means and forpermitting access to the current transformers and connections thereto insaid transformer compartment.

Reissue No. 19,797

(Seal) dinally through the connected bus compartments.

mitting access to both of said compartments in- 32. superstructureformetal clad switchgear of the drop-down type including a supportingframe and a switch unit having disconnecting contacts vertically movabletherein to connected and disconnected positions. comprising a unitary 5sheet metal housing having a metallic isolating partition for dividingthe same into a busbar compartment and a current transformercompartment. fixed conducting means disposed in each of saidcompartments and establishing cirl0 cuit connections through aperturesin the bottom walls of said compartments with said movable disconnectingcontacts, said conducting means including fixed disconnecting contactsengageable by the movable disconnecting contacts, said 15 bus barcompartment having apertures in the side walls thereof for permittinginspection and extension of the busbars therein, closures for saidapertures, removable cover structure forming part of the top of saidhousing for permitting acso cess to both of said compartments, includingthe connections to the fixed conducting means and for permitting accessto the currenttransiormers and connections thereto in said transformercom- 25 partment.

ALLEN M. ROSSMAN.

CERTIFICATE OF CORRECTION.

December 24, 1935.

. ALLEN m. ROSSMAN.

It is hereby certified that the name of the assignee in the abovenumbered patent was erroneously described and specified as"RossmamSargent & Lundy Patents Corporation, of Chicago, Illinois"whereas said name should have been described and specified as Ros'smanEngineering Company, a Corporation of Illinois, as shown by the recordsof assignments in this office; and that the said Letters Patent shouldbe read with this correction therein that the same may conform to therecord of the case in the Patent Office.

Signed and sealed this 18th day of February, A. D. 1936.

Leslie Frazer Acting Commissioner of Patents.

